Both converters can operate in a rectifier mode or in an inverter mode

A DC branch links these two converters by a storage capacitor.

Operating Principle

Conceptually, a generalized SVS

Converter2 injects a voltage Vpq with phase angle in series with TX line via an insertion transformer

Main function of converter1 is to supply the real power demanded by converter2 at the DC link

No reactive power flow through DC link

Conclusion

Most sophisticated power flow controller Expensive
Gives better performance as compared to STATCOM,SSSC and TCSC
Provide simultaneous, real-time control of all basic power system parameters (transmission voltage, impedance and phase angle) and dynamic compensation of ac system

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